|
if you want to force the user to correct any problem, then your validation code should:
- tell your user what is wrong
- tell your user he should fix it
- disable everything that looks like it is accepting the data as is, including OK, Save and Close buttons
- keep a Cancel button enabled, so the user can still abandon everything
Luc Pattyn
Local announcement (Antwerp region): Lange Wapper? Neen!
|
|
|
|
|
Is there possible to change an image in a panel at particular time period in c#.net
I Have 6 Images and 2 picture box....
First on load of form 2 images i have to display.. after 30 seconds another 2 images.. and after 30 sec another 2 images..and after that again circular cycle is start..
Pls Help Me
|
|
|
|
|
Yes, it is. Where are you stuck?
|
|
|
|
|
I am just at a loss to think that i use threading and make that sleep or i use timer on which i write code on Click event..
Actually tell me how i can do this...i hav to change imag in every 30 sec.. which path is stotred in xml database file on client machine...
|
|
|
|
|
Use the timer, its easier than using a background thread which can't update the UI directly.
Sachin Dubey wrote: xml database file
Now there's an oxymoron for you 
Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP
|
|
|
|
|
For periodic actions on the GUI, use a System.Windows.Forms.Timer; its Tick handler runs on the GUI thread, so you can manipulate Controls without any problem.
Luc Pattyn
Local announcement (Antwerp region): Lange Wapper? Neen!
|
|
|
|
|
|
hi all,
In Visual studio's code editor, when the intellisense window pops up, the focus always remains on the editor window (instead of jumping to the popup window, I think this could have been handled by a SetWindowPos call with SWP_NOACTIVATE), what has puzzled me so much is that if you mouse-click an item or even drag the vertical scroll bar on the popup window, the focus still remains, the cursor flashes at the last character you have typed.
How is that possibly done?
|
|
|
|
|
The trick is to set the focus back to the text control after the code completion window is shown and after scroll bar value changes.
Control _parent = null;
void Show(Control parent) {
this.Show();
_parent = parent;
_parent.Focus();
}
void ScrollValueChanged(.....) {
_parent.Focus();
}
|
|
|
|
|
thank you Shameel.
I think this is a good solution, but not a perfect one. And i don't think Microsoft Visual Studio team has done this by this means. Seems the popup window can never be activated, by that I mean either the window is of WS_EX_NOACTIVATE style or it responds WM_MOUSEACTIVATE by MA_NOACTIVATE.
I made some test code on this using Winform. The popup window was made by a Form window hosting a ListBox window, I overrided the CreateParam to append the WS_EX_NOACTIVATE style for both two windows, I also overrided WndProc to make them respond WM_MOUSEACTIVATE by MA_NOACTIVATE. But all these didn't work:^^(
Maybe I have misunderstood WS_EX_NOACTIVATE or WM_MOUSEACTIVATE?
|
|
|
|
|
I've been playing around with a DataGridView today. 
One of the things I noticed is that the ScrollBars behave differently when the thumb is dragged...
The vertical ScrollBar scrolls the rows one whole row at a time.
The horizontal ScrollBar scrolls the columns smoothly (which I suppose is usually the desired behaviour).
Because all my columns are the same width (and narrow -- think of a Scrabble board implemented with a DGV) I would prefer to scroll a whole column at a time.
Has anyone here achieved this?
This isn't actually a big deal, just a "nice to have". (I expect someone at MS considered it a YAGNI.)
Solution:
In my earlier attempts, I had been trying to force the scrollbar to jump by the column width.
Altering the HorizontalScrollingOffset directly to a value that is a multiple of the column width (X below) achieves the desired effect.
private void
dgResults_Scroll
(
object sender
,
System.Windows.Forms.ScrollEventArgs e
)
{
if ( e.ScrollOrientation == System.Windows.Forms.ScrollOrientation.HorizontalScroll )
{
this.dgResults.HorizontalScrollingOffset = e.NewValue / X * X ;
}
return ;
}
modified on Thursday, September 24, 2009 5:21 PM
|
|
|
|
|
I used the Visual Basic PowerPacks OvalShape in my program.
When I clicked on the oval, there will be blue dots appearing around it.
Why?
|
|
|
|
|
I have created an On-screen-Keyboard as a WPF user control.
This WPF user control works fine (whenever i press a button,the text goes to the focused element) when used in a WPF application.
But when i use this WPF usercontrol in a Winform application using elementhost.child, the text doesnot go to any focused element in winform.
How do i route the OSK text content[when i press any key..i.e. button] to any focused element[eg: textbox] in winform?
|
|
|
|
|
Hello Friends,
I am not able to set the cell value of datagridview on cell double click.
here is the code on cell double click :
GV.Rows(e.RowIndex).Cells(e.ColumnIndex).ReadOnly = False
GV.Rows(e.RowIndex).Cells(e.ColumnIndex).value = "TEST"
It is giving System.Data.ReadOnlyException.
Thanks & Regards,
Rahul
rahul saini
|
|
|
|
|
What is the DataSource for the DataGridView?
What is the full error message?
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
|
|
|
|
|
Hello Henry,
I am using DataGridView and bind it with DataTable.
Error Description:
DataGridView column bound to a read-only field must have ReadOnly set to True.
above error comes on this statement:
GV.Columns(e.ColumnIndex).ReadOnly = False
==================other error:============
this error occur on :
GV.Rows(e.RowIndex).Cells(e.ColumnIndex).ReadOnly = False
GV.Rows(e.RowIndex).Cells(e.ColumnIndex).Value = "text"
DataGridView Default Error Dialog
The following exceptions occurred in the DataGridView
System.Data.ReadOnlyException: Column 'Status' is Read only
at System.Data.Datarow.set_Item(DataColumn column, Object value)
at System.Data.DatarowView.SetColumnValue(DataColumn Column, Object value)
at System.Data.DataColumnPropertyDescriptor.SetValue(Object Component, Object value)
at System.Windows.Forms.DataGridView.DataGridViewDataConnection.PushValue(Int32BoundColumnIndex,
Int32 columnIndex, Int32 rowIndex, Object value)
To replace this default dialog please handle the DataError event
Regards
Rahul
rahul saini
|
|
|
|
|
then clearly the problem is that the column in the DataTable is readonly, so presumably it is in the underlying database. Trying to change the ReadOnly property in your DataGridView cannot possibly alter this.
You have to investigate, and find out why the underlying data is readonly. DataColumn has a ReadOnly property and maybe this is being set to true somewhere else in your code.
There are loads and loads of possible reasons, but from the error message, it clearly is not the DataGridView that is causing the problem.
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
|
|
|
|
|
|
Hi,
I would suggest that you use a stored procedure like below.
CREATE procedure pr_Insert_image
@ImageName as varchar(20),
@Image as image
as
if not exists (select * from tblimages where ImageName =@ImageName )
begin
insert into tblimages(ImageName ,Image)values(@ImageName ,@Image)
end
To convert an image in .Net you could do this like below
Dim objImageB As System.Drawing.Image
objImageB = Drawing.Image.FromFile(Server.MapPath("~/images/no-photo-Available.jpg"))
|
|
|
|
|
bluepoison wrote: objImageB = Drawing.Image.FromFile(Server.MapPath("~/images/no-photo-Available.jpg"))
It is a windows application and not a web application.
It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD
|
|
|
|
|
still could not figure it out is this impossible 
|
|
|
|
|
Hi all,
I want to make something like the Visual Studio start page appear in a MDI child in my winforms app. I know about using WebBrowser control, and I know about SharpDevelop (but I am not looking to do something as complicated as it). I have a WebBrowser docked to fill my form's client area and I want to display a webpage in it that's also an ASP web form, so I can list the user's recently used files and allow them to run commands by clicking on links etc., just like Visual Studio. But I want the web page to be embedded in my application's resources so I don't have to drag a copy of it around on disk to ship with my app.
How do you do such a thing, and also get referenced images in <img> tags to come out right?
TIA
Brian
|
|
|
|
|
Hi,
you can tell a WebBrowser to navigate to a URL, or a file, or you can feed it a string corresponding to the page content; see the DocumentText property. Just put everything from <html> to </html> in one big string, which you may or may not store as a resource inside your app.
Luc Pattyn
Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.
Local announcement (Antwerp region): Lange Wapper? Neen!
|
|
|
|
|
Good answer, and I've already thought of that. What I am having a problem with is images, say, via the <img> tag in my HTML and I reference a file also in my resources. It's not working when I call up the HTML in the WebBrowser. I have, e.g., a file called studioheader.png in my resources, and the HTML I load (through the WebBrowser.DocumentText property) is, just as a simple example:
<html>
<head>
<title>Start Pagestudioheader.PNG is in my Resources. The very same HTML is loaded into the WebBrowser.DocumentText property on Form_Load event, but when I bring up the form in my app, the WebBrowser control does not display the image. I don't want to put the image on some server somewhere; I want to bundle it with my application resources, so I can depend on it always showing up, no matter where my app is installed.
Sincerely Yours,
Brian Hart
|
|
|
|
|
Hi Brian,
there is a solution to that, not a very simple one though. It basically consists of embedding a web server into your application, and letting your WebBrowser show actual pages originating from that web server. The complexity depends on the features you would want; just delivering files should be very easy (remember, each image just causes another HTTP GET request to the server, and gets answered by sending the image file). Things would become real complex if you want to handle forms, AJAX, etc.
I trust CodeProject holds some decent articles on the subject, maybe tthis one[^] could help.
Luc Pattyn
Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.
Local announcement (Antwerp region): Lange Wapper? Neen!
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
